The most common ventilation in the NW is a good exhaust fan like a "Quiet Vent" with Fresh 80s fresh air inlets. If there is a basement involved, maintain <50%RH with good dehumidifier like a small "Santa Fe". Nothing wrong with an ERV except with the mild temps you have, the pay back is never. During cool wet weather, maintaining +65^F is important to avoid high %RH in the conditioned space. If not heated or dehumidifier, the space may get musty from high %RH.
Regards TB
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"